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Black coquin

The black clamshell (Scrobicularia plana), river clamshell or mud clamshell, is a bivalve mollusk that inhabits estuaries and marshes, preferring, unlike the white clamshell (Donax trunculus), mud bottoms to sandy ones.

It is also known as San Fernando coquina because it is very common in the marshes and estuaries of this Cadiz town.
It is characterized by its dark color and by having flatter shells than the white clamshell (Donax trunculus), a species of mollusk that prefers sandy bottoms.

In gastronomy, it is a highly appreciated mollusk in the Bay of Cádiz, being totally unknown outside that area.